兴大报告XingDa Lecture 647

文摘   科学   2023-11-27 13:10   北京  




报告详情


报告人:韩宇

华南理工大学
注:本次报告为线下报告。
时间:2023年12月01日(星期五)14:00
地点:化学院百廿纪念报告厅(A204)‍‍‍
主请人:周继寒‍‍‍‍‍‍




报告摘要


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Through the Lens: Exploring Chemistry with Transmission Electron Microscopy


This presentation comprises two sections. In the first segment, I will expeditiously address the challenges associated with obtaining high-resolution (scanning) transmission electron microscopy ((S)TEM) images for materials sensitive to electron beam irradiation. Additionally, I will introduce innovative techniques developed to surmount these challenges, including ultralow-dose high-resolution TEM (HRTEM) [1-3], integrated differential phase contrast STEM (iDPC-STEM) [4], and ptychographic reconstruction based on four-dimensional STEM (4D-STEM) data [5]. If time permits, I will also provide a brief overview of cryogenic focused ion beam (cryo-FIB) as a specimen preparation method for (S)TEM [6]. In the second part of the presentation, I will illustrate the practical application of (S)TEM in the realm of chemical research and related disciplines through several compelling examples.

References

[1] Unravelling surface and interfacial structures of a metal-organic framework by transmission electron microscopy. Nat. Mater. 2017, 16, 532-536.

[2] Atomic-resolution transmission electron microscopy of electron beam-sensitive crystalline materials. Science 2018, 359, 675-679.

[3] Imaging defects and their evolution in a metal-organic framework at sub-unit-cell resolution. Nat. Chem. 2019, 11, 622-628.

[4] Direct Imaging of Atomically Dispersed Molybdenum that Enables Location of Aluminum in the Framework of Zeolite ZSM-5, Angew. Chem. Int. Ed., 2020, 59, 819-825

[5] Three-dimensional inhomogeneity of zeolite structure and composition revealed by electron ptychography. Science 2023, 380, 633-638.

[6] Cryogenic focused ion beam enables atomic-resolution imaging of local structures in highly sensitive bulk crystals and devices. J. Am. Chem. Soc. 2022, 144, 3182-3191.



报告人简介

韩宇博士于2003年在吉林大学获得博士学位,2003-2008年在新加坡A-Star任研究科学家,2009至2023间,就职于沙特阿卜杜拉国王科技大学,是化学和化学工程系教授。2023年9月,入职华南理工大学,任电子显微中心主任。韩宇博士主要从事多孔材料的合成与应用(催化、分离、水处理),以及电子束敏感材料的高分辨电子显微成像方面的研究,是超低剂量电子显微成像技术的联合发明人。发表学术论文400余篇,其中包括权威期刊如Nature、Science、Nature Nanotechnology、Nature Chemistry、Nature Materials等,总引用次数超过40,000,H-index大于100。韩宇教授2004年被麻省理工学院《科技评论》杂志评选为百名青年发明家,2006年获新加坡青年科学家奖;2008年获Thomson Reuters Research Fronts Award (汤姆逊研究前沿奖);2016年被评为中国教育部长江学者讲座教授;2021年获得德国洪堡研究奖;2019-2023连续5年科睿唯安(Clarivate Analytics)高引学者。




兴大报告
北京大学化学学院兴大报告系列讲座从1995年开始,为促进化学学院的国内外学术交流、营造活跃的学术交流氛围发挥了重要作用,是研究生培养过程中一门必不可少的前沿学术报告课程。
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